Research on a Composite Biomass Insulation Material with Geopolymers as Binders and Forestry Waste as Fillers
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https://doi.org/10.1007/s11630-020-1387-y
Article ID: 1003-2169(2020)00-0000-00
Research on a Composite Biomass Insulation Material with Geopolymers as Binders and Forestry Waste as Fillers LI Hongqiang1,2,3*, ZOU Si1, LIU Tiantian1, WANG Shuang1, ZOU Jun4, ZHANG Xiaofeng5, LIU Lifang6, BAI Chengying7, ZHANG Guoqiang1 1. College of Civil Engineering, Hunan University, Changsha 410082, China 2. National Center for International Research Collaboration in Building Safety and Environment (NCIRCBSE), Hunan University, Changsha 410082, China 3. Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan University, Changsha 410082, China 4. State Key Laboratory of Plant Physiology and Biochemistry, China Agricultural University, Beijing 100193, China 5. College of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China 6. College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China 7. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: A composite biomass insulation material, which uses geopolymers as adhesives and forestry waste as fillers, was proposed and experimentally tested. The orthogonal experimental method was adopted to analyze the optimum theoretical oxide molar ratios and the mass ratio of mixing water to binder (mw2/mB) for preparing geopolymers. The influences of curing regimes (including one-stage and two-stage curing methods) and mw2/mB ratios of the insulation materials on mechanical, thermal, and hydraulic performances were also studied by experiment. The results indicated that the optimum combination scheme of preparing geopolymers was molar ratio xSiO2 / xNa 2O 3.3 , xSiO2 / xAl2O3 3.2 and mw2/mB =0.5 with the highest mechanical strength of 34.21 MPa. Besides, the best curing conditions of the composite material were the curing temperatures of 85°C and 70°C under the two-stage curing regime, which could achieve the low heat conductivity of 0.123 and 0.125 W/(m·K), and the high mechanical strength of 1.70 MPa and 1.71 MPa, respectively. The optimum mw2/mB ratios of the biomass material were 0.5 to 0.55 with heat conductivity of 0.114 to 0.125 W/(m·K). This novel composite insulation material has satisfying physical performances, which is helpful for achieving building energy conservation.
Keywords: sawdust, forestry waste, energy conservation, prefabricated buildings, composite biomass insulation materials
Received: Dec 20, 2019
AE: WANG Lin
Corresponding author: LI Hongqiang
E-mail: [email protected] www.springerlink.com
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J. Therm. Sci., Vol.29, No.*, 2020
Nomenclature Abbreviation sum value of the experimental results which KXm contains the factors with m level mean value of experimental results containing kX
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